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The Cambridges both briefly ground to a halt at the same notoriously difficult spot half-way up a rock crawl where they had to navigate over huge boulders that pitched the vehicle up and down.

The Jaguar Land Rover Experience states on its Solihull website, under the terms and conditions: "The course may be unsuitable for those who suffer from back problems (or any other similar conditions).

"It may also be unsuitable for those who are pregnant. We would therefore recommend that you do not participate in the driving experience if you suffer from back problems, heart problems (or any similar conditions or are pregnant)."

Land Rover Experience lead instructor Ro Furby, who accompanied the Duke around the circuit, said the royal guest had done "amazingly well" at the wheel of a Mountain Rescue liveried 4x4.

"It was an absolute privilege to take him round off-road and show him the capability of the vehicles," she told reporters.

The Duchess of Cambridge in a Land Rover Discovery (Image: Darren Quinton)

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Observing that almost every driver new to the course stops at a "little quirk" part-way up the rock crawl, Ms Furby added: "It's just a point where the vehicle actually articulates and you lose a little bit of traction.

"And you learn that a nice way to recover from a loss of traction is to change your lines subtly. It's something that we do use as learning for any guest that actually takes on that obstacle."

During their visit to the area, William and Kate visited the Duke's "other passion" Aston Villa football club, to support their sports coaching initiative.

The Coach Core scheme was designed by The Royal Foundation of the Duke and Duchess of Cambridge and Prince Harry, aimed at taking young people from deprived areas and turning them into the next generation of sports coaches.

Keith Wyness, club chief executive, spoke with the Duke and then turned to Kate to quip: "Welcome back to the home of one of your husband's other passions."